Sample-taking drill



W. E. REMBERT.

SAMPLE TAKING DRILL.

APPLICATION FILED JULY}, 1920.

Patented Aug. 9, 1921.

. To all whom it may concern.

* eerie his VIILLIilJlaI E. REMBER-T, OF GILLIAIv'E, LO'UESIANA,

SAMPLE-TAKING DRILL;

Application filed July 3,

Be it known that I, VVILLIAB'I E. REMBERT, a citizen of the United States, residing at Gilliam, Caddo pa'rish, Louisiana, have invented a certainwnew and useful Improvement in Sample-Taking Drills, of which the following is a full, clear, and exact description, .such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to drill bits for use in obtaining samples of material being drilled. It has particular application to rotary' earth boring drills for use in boring wells for water, oil, sulfur, etc.

An object of my invention is to provide a drilling bit, which is especially adapted to shear, or cut away, a sample of the material at the bottom of the well, and to retain this material intact while the drill is withdrawn from the well.

Another object is to provide an especially efiicient means to prevent the loss of the sample thus obtained while the drill is being withdrawnto the surface.

Referring to the drawings formirw a part of this specification, and wherein like numerals are applied to like parts throughout the several views, Figure l is a'central longitudinal section through my improved sampletaking drill; Fig. 2 is a side elevation of the same; and Fig. 3 is a bottom plan view thereof.

The drill bit disclosed in the drawings is not devised for performing the operation of drilling a well, for such a drill can not be repeatedly withdrawn from the well whenever a small portion of the material is obtained. It will readily be seen that in deep wells, the greater part of the time in drilling would be consumed in going into and coming out of the hole. My device is designed to be used to obtain samples of the material, at suitable intervals, so that an accurate log of the well may be preserved. It will ordinarily be used in cooperation with a fish tail bit, which bores a hole with a flat bottom.

The sample taking bit shown in .the drawing is cylindrical in shape, The body of the bit comprises a tubular member 1', threaded interiorly at 2, adjacent the upper end, for attachment to the drill stem 8. The lower end is closed by a plane bottom member 4- made integral with the member 1. Centrally of the bottom face of the bit is formed a tapered screw member 5, having a spiral V Specification of Letters Patent.

Patented am. a, 1921. 1920. Serial No. 393,836. 7

thread thereon. This member is adapted to center the bit in the hole.

The cutting blade on this sample-taking device is formed by cutting a sector-shaped opening 6 in the bottom and bending one of the radial edges thereof outwardly and sharpening the bent edge to form blade 7. This blade extends slightly downwardly from the lower bottom face i and acts to cut the bottom of the hole.

The. sector-shaped opening oallows passage of the material, .thus sheared from the bottom of the hole, into the interior of the drill. To prevent the loss of this material when the bit is withdrawn from the hole, a thin resilient diaphragm 8 of metal, shaped to cover the opening. is fitted over the same and secured to the bottom at the side of said opening opposite the blade 7. This diaphragm is normally bent upwardly at the edge 9 adjacent the blade 7 so that the material can bend the same upwardly and find an easy entrance to the bit.

- To provide proper clearance for the bit in its operation, a short vertical cut is made in the side wall of the bit, at 10, adjacent the blade 7. The slit thus formed is cut laterally at its upper end and a portion of the wall thus cut is bent outwardly to form a blade 11 sharpened at its outer edge. This side blade 11 projects forwardly in the direction of rotation of the bit, as does the blade 7, and acts to shear a small clearance from the side wall of the hole.

In the operation of this sampler, the drill used in cutting the hole-ordinarily a fish tail bitis operated until a stratum is reached of which a sample is desired. The fish tail bit is then withdrawn from the hole and my sampling bit is substituted therefor. The device is then introduced into the hole and a current of flushing water is used to wash out the hole. After the hole is properly cleaned, the bit is rotated in the usual right-hand direction until a sufficient sample of the material is obtained. The device is then withdrawn from the hole; The weight of the material rests upon the bottom of the device and forces the diaphragm over the opening 6 so as to securely close the same and prevent the loss of any portion of the sample thus removed. When the drill is drawn to the surface, it is unscrewed and removed from the pipe and the sample is thus obtained. The drilling may then proceed in the usual way until a further sample is desired. Thesample taking device thus. I

formed is simple and ruggedin construction and adapted to withstand, the heavy strains towhich it is subjected in deep well-drilling. Its flat bottom especially adapts it for use with the type ofdrill ordinarily employed and not only enables the cutting blade 7 and closure 8 to be cheaply madefbut produces v ters Patent is a structure adapted'to operate with great efficiency.

Having thus described my invention,what

I claim as new and desire to protect by Letl; A sample taking bit comprising a tubular member having an integralflat bottom thereon, said bottom having a sector-shaped opening therein, a radial cutting blade formed by bending one edge of said opening outwardly and sharpening the same, a short blade at the lower side adjacent thebottom,

to out the side of the hole and'means to close said sector-shaped opening for the purpose described. I

comprising a cylindrical member, a flat bot tom therein having a radial opening, one

edge of which is turned downwardly and 3. A sample taking bitfor well drilling sharpened, a short "laterally extending'blade at the outer end of said opening, and a re-" silient diaphragm closing said opening, said diaphragm being'secured at one side of said opening'and adapted to be opened upwardly by the pressureof the work' in the manner described.

In testimony whereof I hereunto afliX my vsignature, this the15 day of J line, AID.

1920. i v p WM REMBERT, 

